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hydrogen 5,6-dichloro-2-[3-[5,6-dichloro-1-ethyl-1,3-dihydro-3-(3-sulphonatobutyl)-2H-benzimidazol-2-ylidene]propen-1-yl]-1-ethyl-3-(3-sulphonatobutyl)-1H-benzimidazolium related products: